Method of mitigating ionospheric errors for ground-based augmentation systems (GBAS) using geosynchronous satellite augmentation system (SBAS) grid point ionospheric vertical delay error (GIVE) information

摘要

GBAS includes reference receivers, processing module, and communication device. Processing module checksGNSS satellite measurements to determine proximity of GNSS satellite measurement's IPP to IGPs derived from SBAS geostationary satellites. Processing module determines that GNSS satellite measurement is safe for mitigation using overboundedVertical Ionosphere Gradient standard deviation sigma-vig (à vig ) when IGPs possess acceptable GIVE values. Processing module determines whether number of GNSS satellite measurements determined safe for mitigation using à vig are able to produce VPL that meets VAL required for precision approach. Communication device communicatesoverboundedà vig along with differential corrections and indication of which GNSS satellite measurements that are safe for mitigation using at least one overboundedà vig are able to produce VPL that meets VAL required for precision approach to GNSS receiver when number of GNSS satellite measurements determined safe for mitigation using overboundedà vig are able to produce VPL that meets VAL required for precision approach.